Abstract:

This paper analyzed wind turbine model used in offshore direct-drive permanent magnet synchronous generator and its operation characteristics. Based on improved direct torque control technology with adaptive full-order stator flux observer and on-line identification of stator resistance, induction motor was used to simulate the output characteristic of wind turbine. Simulation results show that the improved direct torque control decreases the current and torque ripple of induction motor at low speed range in traditional direct torque control, which is more suitable for offshore direct-drive permanent magnet synchronous generator running in low-speed.

Key words: offshore wind turbine, simulation system of offshore wind turbine, improved direct torque control, adaptive full-order stator flux observer, on-line identification of stator resistance